Metal free fixed restorations, cadcam technology

Transcription

1 Metal free fixed restorations, cadcam technology

2 All ceramic systems? n n n n n Esthetics Biocompability No corrosion No allergy Optical properties (metal free restorations can reproduce natural aesthetics )

3 n n n n driving forces for developments: Public perception that metal-free restorations are more aesthetic Disadvantages of the metal ceramic systems include radiopacity, some questions centring around metal biocompatibility and lack of natural aesthetics Difference in reliability between metal-ceramic systems and all-ceramic systems

4 Ceramics not only for veneering Ø PJC Feldspar-Quartz-Kaolinite

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6 Improved Materials

7 Manufacturing methods Movement from lost wax casting to dental CAD/CAM Application of science to dentistry n Lost wax casting Hard ceramics n CAD/CAM system

8 All ceramic restorations Laboratory processing n Silicate ceramics o Sintering o Casting o Pressing o CAD/CAM n Oxidceramics o infiltration and /or CAD/CAM technology

9 Sintering Sintering is a method for making objects from powder, by heating the material (below its melting point) until its particles adhere to each other The base-material for heating ceramic on: - platinum foil (removable heat-resistant cap from the gypsum cast) - Heat resistant investment material made cast - Hydrothermal glass/ Duceram LFC under vacuum to prevent porosities

10 opaque Base dentin opaque dentin dentin clear fluorescence enamel

11 n Casting (Dicor) Casting is a process by which a material is introduced into a mould while it is liquid, allowed to solidify in the shape inside the mould, and then removed producing a fabricated object Cast using lost-wax investment method followed by heat-treatment to precipitate a crystalline phase Pressing (Empress, Imax) Pressed ceramic technology produces consistently precise crowns by eliminating shrinkage, porosity and the inconsistency of brush build-ups

12 CAD/CAM technology n n n Scanner - digital impression of the prepared teeth Software CAD - digital cast on the screen - virtual design of the model Milling unit CAM - computer aided milling unit (cnc) - grinding process

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14 Frameworks zirconium oxide

15 CAD/CAM methods n n n In clinic - the dentist purchases an intra-oral scanner, the cutting machine and the consumable materials. All the work is done by the dentist at the clinic. Mainly suitable for full crowns, inlays and onlays. In lab - the laboratory purchases a scanner, cutting machine and consumables. The dentist sends the patient's impressions and prescription to the lab. The lab scans models of the prepared teeth, designs the restoration and machines the restoration. Centralised machining - in this situation the lab purchases or leases a scanner only. Again, the dentist sends the patient's impressions and prescription to the lab. The lab scans models of the prepared teeth and designs the coping and then sends this data off to an external machining centre. The machined coping is returned to the lab for veneerig. n Centralised scanners and machining - the laboratory sends the model away to the external centre to be scanned. The coping is also designed and machined at the external centre. The model and coping are sent back to the lab for veneering.

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21 intraorális szkennelés szék melletti ellenőrzés CAD modell CAM modell CAD váz átadás leplezés CAM váz vázpróba CAM modell és váz

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23 intraorális szkennelés szék melletti ellenőrzés CAD modell CAM modell CAD váz átadás leplezés CAM váz vázpróba CAM modell és váz

24 Balogh Zsolt ftm.

25 szék melletti intraorális ellenőrzés szkennelés CAD modell CAM modell CAD váz átadás leplezés CAM váz vázpróba CAM modell és váz

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27 Adrian Apreotesei ftm.

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32 Fülöp István Ftm.

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36 Böröczky Attila ftm.

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40 Thank you for your attention!